<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <script>
        let url = 'http://www.bing.com/';
        if(url.startsWith('http://') && url.endsWith('/')) {
            alert('是网址');
        } else {
            alert('不是网址');
        }
    </script>
</body>
</html>